Tracce

L'app Android TV potrebbe supportare più tracce audio/testo per diversi lingue e impostazioni dell'audio surround come il ricevitore web app. Per poter supportare più tracce e la selezione delle tracce, devi: implementa quanto segue nell'app Android TV:

Fornisci le informazioni e lo stato del brano

Per i modelli MediaInfo, che fornisce la disponibilità MediaTracks utilizzando MediaInfoModifier:

Kotlin
val mediaInfoModifier = CastReceiverContext.getInstance()
            .mediaManager.mediaStatusModifier.mediaInfoModifier

mediaInfoModifier.setMediaTracks(Arrays.asList(
    new MediaTrack.Builder(1, MediaTrack.TYPE_AUDIO)
        .setName("English")
        ...
        build(),
    new MediaTrack.Builder(2, MediaTrack.TYPE_AUDIO)
        .setName("Spanish")
        ...
        .build()
  ))
Java
MediaInfoModifier mediaInfoModifier = CastReceiverContext.getInstance()
    .getMediaManager().getMediaStatusModifier().getMediaInfoModifier();

mediaInfoModifier.setMediaTracks(Arrays.asList(
    new MediaTrack.Builder(1, MediaTrack.TYPE_AUDIO)
        .setName("English")
        ...
        build(),
    new MediaTrack.Builder(2, MediaTrack.TYPE_AUDIO)
        .setName("Spanish")
        ...
        .build()
  ));

Utilizza le funzionalità di MediaTracksModifier in base alle tracce attualmente selezionate:

Kotlin
val mediaStatusModifier: MediaTracksModifier =
      CastReceiverContext.getInstance()
          .mediaManager.mediaStatusModifier.getMediaTracksModifer()

MediaTracksModifier.setActiveTrackIds(longArrayOf(1))
Java
MediaTracksModifier mediaStatusModifier =
  CastReceiverContext.getInstance()
    .getMediaManager().getMediaStatusModifier().getMediaTracksModifer();

MediaTracksModifier.setActiveTrackIds(new long[]{1});

I passaggi precedenti consentono di assicurarsi che la finestra di dialogo per la selezione della traccia del mittente rifletta i seguenti valori: lo stato corretto.

Gestire la selezione delle tracce

Per poter selezionare una traccia, devi prima dichiarare MediaStatus.COMMAND_EDIT_TRACKS come comando multimediale supportato MediaStatusModifier:

Kotlin
CastReceiverContext
    .getInstance()
    .getMediaManager()
    .getMediaStatusModifier()
    .setMediaCommandSupported(MediaStatus.COMMAND_EDIT_TRACKS, true)
Java
CastReceiverContext
    .getInstance()
    .getMediaManager()
    .getMediaStatusModifier()
    .setMediaCommandSupported(MediaStatus.COMMAND_EDIT_TRACKS, true);

Quando l'utente seleziona le tracce nella finestra di dialogo di selezione delle tracce sul lato mittente, l'app Android TV riceve un callback per cambiare i canali selezionati. Gestire il comando eseguendo l'override MediaCommandCallback:

Kotlin
class MyMediaCommandCallback : MediaCommandCallback() {
  /** Text selection callback scoped to individual track types.  */
  override fun onSelectTracksByType(
        senderId: String?, type: Int, tracks: List
    ): Task {
    return Tasks.call {
        // Update the track selection in your app.
        if (type == MediaTrack.TYPE_TEXT) {
             mySelectTextTracks(tracks)
        } else if (type == MediaTrack.TYPE_AUDIO) {
             mySelectAudioTracks(tracks)
        }
        // Update the track selection in the modifier to be used in MediaStatus.
        // This is also scoped to the given track type.
        mediaStatusModifier.getMediaTracksModifier().setActiveTracksByType(
            type, tracks
        )
        null
    }
  }

  /** Callback for setting the text track style.  */
  override fun onSetTextTrackStyle(
        senderId: String?, textTrackStyle: TextTrackStyle
    ): Task {
    return Tasks.call {
        // Update the track style in your app.
        mySetTextTrackStyle(textTrackStyle)
        // Update the track style in the modifier.
        mediaStatusModifier.setTextTrackStyle(textTrackStyle)
        null
    }
  }

  // Override the following callback in case you want to handle the original
  // request. This is strongly not recommended.
  //
  // The default implementation automatically translates into
  // onSelectTracksByType() and onSetTextTrackStyle().
  override fun onEditTracksInfo(
    senderId: String?, editTracksInfoData: EditTracksInfoData
    ): Task {
       ...
  }

  // Override the following callback in case you want to handle the original
  // request. This is strongly not recommended.
  override fun onEditAudioTracks(
      senderId: String?, editAudioTracksData: EditAudioTracksData
    ): Task {
        ...
  }
}
Java
public class MyMediaCommandCallback extends MediaCommandCallback {
  /** Text selection callback scoped to individual track types. */
  @Override
  public Task onSelectTracksByType(
    String senderId, int type, List tracks) {
    return Tasks.call(() -> {
      // Update the track selection in your app.
      if (type == MediaTrack.TYPE_TEXT) {
        mySelectTextTracks(tracks);
      } else if (type == MediaTrack.TYPE_AUDIO) {
        mySelectAudioTracks(tracks);
      }
      // Update the track selection in the modifier to be used in MediaStatus.
      // This is also scoped to the given track type.
      mediaStatusModifier.getMediaTracksModifier().setActiveTracksByType(
        type, tracks);
      return null;
    });
  }

  /** Callback for setting the text track style. */
  @Override
  public Task onSetTextTrackStyle(
    String senderId, TextTrackStyle textTrackStyle) {
    return Tasks.call(() -> {
      // Update the track style in your app.
      mySetTextTrackStyle(textTrackStyle);
      // Update the track style in the modifier.
      mediaStatusModifier.setTextTrackStyle(textTrackStyle);
      return null;
    });
  }

  // Override the following callback in case you want to handle the original
  // request. This is strongly not recommended.
  //
  // The default implementation automatically translates into
  // onSelectTracksByType() and onSetTextTrackStyle().
  @Override
  public Task onEditTracksInfo(
    String senderId, EditTracksInfoData editTracksInfoData) {
    ...
  }

  // Override the following callback in case you want to handle the original
  // request. This is strongly not recommended.
  @Override
  public Task onEditAudioTracks(
    String senderId, EditAudioTracksData editAudioTracksData) {
    ...
  }
}
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